Investigation of CO oxidation over Au/TiO2 catalyst through detailed temperature programmed desorption study under low temperature and Operando conditions

doi:10.1016/j.cattod.2017.02.031

	Investigation of CO oxidation over Au/TiO2 catalyst through detailed temperature programmed desorption study under low temperature and Operando conditions
	Li, Jerry Pui Ho; Liu, Zebang; Wu, Hao; Yang, Yong
	2018-06
发表期刊	CATALYSIS TODAY (IF:5.2[JCR-2023],5.0[5-Year])
ISSN	0920-5861
卷号	307 页码:84-92
发表状态	已发表
DOI	10.1016/j.cattod.2017.02.031
摘要	Using a temperature-programmed online MS system, gas products are directly analyzed at low temperature to understand the reactivity of the surface intermediates on an Au/TiO2 catalyst that exhibits catalytic activity for CO oxidation. CO oxidation was performed over Au/TiO2 catalysts with Au particle size of 3 nm, and a 7.3 wt% loading, focusing on CO-TPD, steady state isothermal titration, high temperature TPR, and low temperature selective TPO experiments. With CO-TPD, we were able to observe directly, the presence of two different CO species adsorbed on the catalyst surface, as well as the respective desorption energies. Steady state isothermal titrations showed two transient processes with different redox sequences, both forming catalytic layers for intermediate storage and subsequent CO2 product formation. High temperature CO titration transients with 200 degrees C pre-oxidation following either isothermal CO titration or high temperature TPR highlights the presence of two oxidative surface intermediate species with different kinetics, with the intermediates purposed as atomic oxygen at the Au NP perimeter and neighboring lattice sites. Finally, low temperature selective TPO beginning at -165 degrees C showed that pre-reduction following oxidation up to -100 degrees C is able to partially convert surface CO species into stable CO2 intermediates, as a higher activation energy was required to fully desorb the CO2 product from the catalyst surface. (c) 2017 Elsevier B.V. All rights reserved.
关键词	Au/TiO2 CO catalytic oxidation MS Perimeter sites Temperature programmed reaction
收录类别	SCI ; SCIE ; EI ; CPCI
语种	英语
资助项目	Shanghai Pujiang Program[15PJ1405800]
WOS研究方向	Chemistry ; Engineering
WOS类目	Chemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
WOS记录号	WOS:000428231400012
出版者	ELSEVIER SCIENCE BV
WOS关键词	GOLD NANOPARTICLES ; ACTIVE OXYGEN ; KINETIC OSCILLATIONS ; PERIMETER ; SURFACE ; ADSORPTION ; INSIGHTS ; SITES
原始文献类型	Article ; Proceedings Paper
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/20191
专题	物质科学与技术学院物质科学与技术学院_PI研究组_杨永组物质科学与技术学院_硕士生物质科学与技术学院_博士生
通讯作者	Yang, Yong
作者单位	ShanghaiTech Univ, Sch Phys Sci & Technol, 100 Haike Rd, Shanghai, Peoples R China
第一作者单位	物质科学与技术学院
通讯作者单位	物质科学与技术学院
第一作者的第一单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Li, Jerry Pui Ho,Liu, Zebang,Wu, Hao,et al. Investigation of CO oxidation over Au/TiO2 catalyst through detailed temperature programmed desorption study under low temperature and Operando conditions[J]. CATALYSIS TODAY,2018,307:84-92.
APA	Li, Jerry Pui Ho,Liu, Zebang,Wu, Hao,&Yang, Yong.(2018).Investigation of CO oxidation over Au/TiO2 catalyst through detailed temperature programmed desorption study under low temperature and Operando conditions.CATALYSIS TODAY,307,84-92.
MLA	Li, Jerry Pui Ho,et al."Investigation of CO oxidation over Au/TiO2 catalyst through detailed temperature programmed desorption study under low temperature and Operando conditions".CATALYSIS TODAY 307(2018):84-92.